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server.go
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server.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package server
import (
"context"
"net/http"
"github.com/gorilla/mux"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"google.golang.org/grpc"
"namespacelabs.dev/foundation/std/go/core"
)
type Registrar interface {
grpc.ServiceRegistrar
Handle(path string, p http.Handler) *mux.Route
PathPrefix(path string) *mux.Route
}
type Server interface {
InternalRegisterGrpcGateway(reg func(context.Context, *runtime.ServeMux, *grpc.ClientConn) error)
Scope(*core.Package) Registrar
}
var _ Server = &ServerImpl{}
// Implements the grpc.ServiceRegistrar interface.
type ServerImpl struct {
srv *grpc.Server
httpMux *mux.Router
gatewayRegistrations []func(context.Context, *runtime.ServeMux, *grpc.ClientConn) error
}
func (s *ServerImpl) RegisterService(desc *grpc.ServiceDesc, impl interface{}) {
s.srv.RegisterService(desc, impl)
}
func (s *ServerImpl) HandleFunc(path string, f func(http.ResponseWriter, *http.Request)) *mux.Route {
return s.Handle(path, http.HandlerFunc(f))
}
func (s *ServerImpl) InternalRegisterGrpcGateway(reg func(context.Context, *runtime.ServeMux, *grpc.ClientConn) error) {
s.gatewayRegistrations = append(s.gatewayRegistrations, reg)
}
// Deprecated; should use InternalRegisterGrpcGateway.
func (g *ServerImpl) RegisterGrpcGateway(reg func(context.Context, *runtime.ServeMux, *grpc.ClientConn) error) {
g.InternalRegisterGrpcGateway(reg)
}
func (s *ServerImpl) Handle(path string, p http.Handler) *mux.Route {
return s.httpMux.Handle(path, p)
}
func (s *ServerImpl) PathPrefix(path string) *mux.Route {
return s.httpMux.PathPrefix(path)
}
func (s *ServerImpl) Scope(pkg *core.Package) Registrar {
return &scopedServer{parent: s, pkg: pkg.PackageName}
}
type scopedServer struct {
pkg string
parent *ServerImpl
}
func (s *scopedServer) RegisterService(desc *grpc.ServiceDesc, impl interface{}) {
s.parent.RegisterService(desc, impl)
}
func (s *scopedServer) Handle(path string, p http.Handler) *mux.Route {
return s.parent.Handle(path, p)
}
func (s *scopedServer) PathPrefix(path string) *mux.Route {
return s.parent.PathPrefix(path)
}
func proxyHeaders(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if forwardedFor := r.Header.Get("X-Forwarded-For"); forwardedFor != "" {
r.RemoteAddr = forwardedFor
}
if host := r.Header.Get("X-Forwarded-Host"); host != "" {
r.URL.Host = host
// Set the scheme (proto) with the value passed from the proxy.
// But only do so if there's a host present.
if scheme := r.Header.Get("X-Forwarded-Scheme"); scheme != "" {
r.URL.Scheme = scheme
}
}
// Call the next handler in the chain.
h.ServeHTTP(w, r)
})
}